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- Newsgroups: comp.sys.mac.hardware
- Path: sparky!uunet!nwnexus!kanefsky
- From: kanefsky@halcyon.com (Steve Kanefsky)
- Subject: Re: Caddyless CD-ROM Drives for the Mac?
- Message-ID: <1992Nov10.163109.23620@nwnexus.WA.COM>
- Keywords: CD, caddy, CD300i, Photo CD
- Sender: sso@nwnexus.WA.COM (System Security Officer)
- Organization: The 23:00 News and Mail Service
- References: <1992Nov9.195547.14783@cs.ucla.edu> <1992Nov10.022058.3245@reed.edu>
- Date: Tue, 10 Nov 1992 16:31:09 GMT
- Lines: 44
-
- In article <1992Nov10.022058.3245@reed.edu> rseymour@reed.edu writes:
- >In article <1992Nov9.195547.14783@cs.ucla.edu> tj@kona.cs.ucla.edu (Tom
- >Johnson) writes:
- >> Does anyone know of any CD-ROM drives (preferably the newer, faster
- >> models that support multi-session Photo CD) that don't require
- >> those stupid disk caddies? I'd like something with a sliding drawer
- >> or one like the in-dash audio players - that slurps it in
- >> automatically.
- >>
- >> For that matter, why are they so ubiquitous in the data world and
- >> so conspicuously absent from the audio world. I can't believe that it's
- >> to protect the disk - they get as much (or more) wear from being
- >> loaded into the caddies, I would think.
- >>
- >> Thanks-
- >> Tom
- >> --
- >> Tom Johnson "They say Confucious does his crossword with a pen."
- >> tj@cs.ucla.edu -Tori Amos
- >
- > It's not to protect the disk, but to ensure higher accuracy in reads.
- >If the disk moves even slightly, bits will register wrong (i.e. the beam won't
- >reflect back directly into the sensor). The reason these aren't as prevalent in
- >audio CD players is that it doesn't matter if you miss a bit on an audio
- >recording, you can't tell the difference (8 bits at 44.1MHz, which is around
- >150K/sec, all of which goes into the sound output).
- > However, in computers, each bit is crutial, hence the caddy. I wouldn't
-
- How can the caddy keep the disc from moving if the disc isn't even
- touching the caddy? The motor and spindle are the only thing attached
- to the disc while it's moving.
-
-
- The caddys *are* used to protect the disc, and they work great if you
- have a caddy for each disc and don't ever take them out. Having a caddy
- for each disc is even conceivable, if you never use audio CDs in your
- CD-ROM drive. Unfortunately, lots of people (including myself) *do*
- want to use audio CDs, and it's a pain to constantly swap discs in and
- out of a caddy. They should probably have just made the caddy a
- standard part of the CD medium, like Sony's doing with the new 3"
- recordable CD medium.
-
- --
- Steve Kanefsky
-